???? ???? ???????? ?? ?????? ?????? ???? ?????? ??? ??????? ?? ???? ??? ??????? ??????? . ????? ??? ??????? ??????? ???? ??????? ??? ?????????. ????? ??????? ??????? ?????????. ????? ?????? ?????? ?????? ?? ???????. ???? ??????? ??????? ????? ????? ?? ???????? . Selecting ???? ????? ??????